Polishing device



A. SCHMIDT POLISHING DEVICE Sept. 6, 1955 Filed July 6, 1954 F/G-E lNVEN/UP United States Patent POLISHING DEVICE Alfred Schmidt, Nurnberg, Germany Application July 6, 1954, Serial No. 441,291

15 Claims. (Cl. 51-187) The present invention relates to a polishing device and more particularly to a long polishing or grinding stick for the smoothing of plane or convex surfaces of any kind.

It is the main object of the present invention to use a piece or strip of emery paper or polishing cloth by means of a polishing stick according to the present invention like a file.

It is a further object of the present invention to give both hands during the use of said polishing stick a good rest and grip and to keep them clean.

It is a further object of the present invention to change a polishing or emery strip within less than 20 seconds and to fasten it tightly and under a certain tension so that no ripples will occur on the strip during its use.

The foregoing objects and others hereinafter described are attained in the embodiment of the invention illustrated in the accompanying drawing in which Fig. 1 is a fragmentary side elevation of the polishing device according to the present invention and Fig. 2 a top plan view thereof.

It designates 1 a long stick of plane hard wood or of any other suitable material which may be 16 inches long and of an inch high. Its width may differ from one to two inches according to the kind of polishing or grinding work to be done. The left front end of the stick 1 is provided with a small slot 2 adapted to receive a strip of thin, flexible material such as emery paper or polishing cloth. This slot extends about one to two inches parallel to the longitudinal axis of said stick and runs parallel to the lower flat side 12 in about half the height of the stick. The slot ends in a cross-bore 4 arranged to avoid spreading of the stick. Perpendicular to the slot 2 and in its middle is arranged a clamping bolt 5. Its head 6 is fastened and countersunk in the lower fiat side 12. Over the free end of the clamping bolt protruding the upper side 3 of the stick 1 is screwed a cylindrical nut 9 with a great ball like handle 7 on its outer end. Said ball like handle which is built to fit easily in the palm of the left human hand has a cast in bore 8 which allows to cut in the thread of the bolt 5 concentrically to the cylindrical part 9 without centering it on a lathe.

If for instance a strip 10 of emery paper, shown in Fig. 1, is to be fastened on the lower fiat side 12 of the stick 1, one of the ends of the strip 10 is brought from the left into the front end of the slot 2 until it touches the bolt 5. Thereafter the strip 10 is bent around the front edge 11 arranged perpendicular to the longitudinal axis of the stick and then adjusted parallel to the lower side 12 so that it runs equally along the lower side 12. Finally the end of the strip 10 is fastened in the slot 2 by turning the handle 7 whereby the slot 2 is pressed together and thus keeps the strip firmly in the desired position.

Behind the free end 13 of the strip 10 and the free part 24 of the stick serving as a handle for the right hand the lower side 12 has a groove 14 which runs perpendicular to the longitudinal axis of the stick 1. Said groove is wider on its bottom and holds there a piece of resilient material such as a strip of soft rubber to overcome the difference in thickness of the strips to be fastened in said groove. The groove is provided for a U-shaped clamping piece 16. The middle part 16 of it is pressed in said groove 14 by a cylindrical cam having a handle 22 and being excentrically pivoted to the free sides 17 of the clamping piece by a stud 21 which fits loosely in an excentric bore 19 of said cam running parallel to its axis but fitting tightly in bores 18 in the sides 17 of the clamping piece 16. The stud 21 extends over the sides 17 of said clamping piece 16 and is held therein by riveting its ends. The handle 22 has an enlarged end 23 and runs parallel to the axis of said stick directed toward the slotted end of the stick if the clamping piece 16 is in its tightening position as shown in the drawing.

To fasten the other end of the strip 10 to the stick, the handle 22 is lifted by pushing a finger below the inclined fiat end 23 of the handle 22 and turning the shaft 20 in Fig. l clockwise about for 180 degrees. This slides the cam 2% in a cavity in the upper side 3 of the stick 1 and the middle part 16 of the clamping piece moves about half an inch away from the lower side 12 of the stick 1. After this is done the free end 13 of the strip 10 is guided through the opening built by part 16 of the clamping piece and the lower side 12 of the stick 1 and held with the one hand by clasping tightly around the free part 24. If now the other hand brings the handle 22 back into the position shown in Fig. l the stud 21 draws the side parts 17 back into the position shown in Fig. 1 and presses the middle part 16 back into the groove together with the strip. Since the hand holding the free end of the strip tries to resist such a movement of the strip said strip gets distinctly stretched and remains in said stretched position because the rubber strip 15 will prevent any further movement of the strip it), if the clamping piece 16 is in the desired position.

The clamping piece 16, 17 does not extend beyond the lower side 12 or the small sides of the stick. But the shaft 2d extends distinctly beyond the upper side 3 of the stick and may be used like the handle 7 as a rest for the hand, if for any reason the free part 24 cannot be used.

The time required for exchanging a strip 10 is about 10 to 20 seconds.

While I have shown and described a preferred embodiment of my invention I do not wish to be limited on the details of disclosure but only in accordance with the appended claims.

Having thus described my invention, what I claim is:

l. A polishing device having in combination a long stick with an upper and lower fiat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, means for pressing the bodies forming the sides of said slot together, a handle on the slotted end and on said upper flat side fitting in the palm of the human hand, a free part on the other end of said stick, a groove on said lower flat side behind said free end and perpendicular to the longitudinal axis of said stick, and clamping means holding said strip into said groove.

2. A polishing device having in combination a long stick with an upper and lower fiat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, said slot being parallel to the longitudinal axis of said stick and parallel to said lower flat side, means for pressing the bodies forming the sides of said slot together, a handle on the slotted end and on said upper fiat side fitting in the palm of the human hand, a free part on the other end of said stick, a groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick, and a clamping piece holding the free end of said strip into said groove.

3. A polishing device having in combination a long stick with an upper and lower fiat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, a clamping bolt arranged in the middle and perpendicular to said slot, its head fastened and countersunk in said lower side and having on said upper side a cylindrical nut with a great ball like handle on its outer end fitting in the palm of the human hand, a free part on the other end of said stick, a groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick, and a clamping piece holding the free end of said strip into said groove.

4. A polishing device having in combination a long stick with an upper and lower flat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, means for pressing the bodies forming the sides of said slot together, a handle on the slotted end and on said upper flat side fitting in the palm of the human hand, a free part on the other end of said stick acting as a handle, a groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick, and a clamping piece holding the free end of said strip.

5. A polishing device having in combination a long stick with an upper and lower flat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, means for pressing the bodies forming the sides of said slot together, a handle on the slotted end and on said upper flat side fitting in the palm of the human hand, a free part on the other end of said stick, a groove on said lower flat side behind said free part and perpendicular to the longitudin ai axis of said stick, containing a piece of resilient material on its bottom, and a clamping piece holding the free end of said strip into said groove.

6. A polishing device having in combination a long stick with an upper and lower fiat side, a slot on one end of said stick being adapted to receive the one end of a strip of thin, flexible material, means for pressing the bodies forming the sides of said slot together, a handle on the slotted end and on said upper flat side fitting in the palm of the human hand, a free part on the other end of said stick, a. groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick and being wider toward its bottom, and a clamping piece holding the free end of said strip into said groove.

7. A polishing device having in combination a long stick with an upper and lower flat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, means for pressing the bodies forming the sides of said slot together, a handle on the slotted end and on, said upper flat side iitting in the palm of the human hand, a free part on the other end of said stick, a groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick, a clamping piece holding the free end of said strip into said groove, said clamping piece being U-shaped and its middle part being pressed into said groove by a cylindrical cam having a handle and being excentrically pivoted to the free sides of the clamping piece.

8. A polishing device having in combination a long stick with an upper and lower flat side, a slot on one end of said stick being adapted to receive the one end of a strip of thin, flexible material, means for pressing the bodies forming the sides of said slot together, a handle on the slotted end and on said upper flat side fitting in the palm of the human hand, a free part on the other end of said stick, a groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick, a clamping piece holding the free end of said strip into said groove, said clamping piece being U-shaped and its middle part being pressed into said groove by a cylindrical cam having a handle and being excentrically pivoted to the free sides of the clamping piece, said handle being parallel to the axis of said stick and having its free end toward said slotted end of said stick if said clamping piece is in its tightening position.

9. A polishing device having in combination a long stick with an upper and lower flat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, means for pressing the bodies forming the sides of said slot together, a handle on the slotted end and on said upper flat side fitting in the palm of the human hand, a free part of the other end of said stick, a groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick, a clamping piece holding the free end of said strip, said clamping piece being U-shaped and its middle part being pressed into said groove by a cylindrical cam having a handle and being excentrically pivoted to the free sides of the clamping piece, and a cavity on said upper side for guiding and holding said cylindrical shaft on said stick.

10. A polishing device having in combination a long stick with an upper and lower flat side, a slot on one end of said stick being adapted to receive the one end of a strip of thin, flexible material, means for pressing the bodies forming the sides of said slot together, a handle on the slotted end and on said upper flat side fitting in the palm of the human hand, a free part on the other end of said stick, a groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick, a clamping piece holding the free end of said strip into said groove, said clamping piece being U-shaped and its middle part being pressed into said groove by a cylindrical cam having a handle and being excentrically pivoted to the free sides of the clamping piece by a stud fitting loosely in an excentrical bore of said cam running parallel to its axis and tightly fitting in bores of said clamping piece and being held in its position by riveting the ends extending over the sides of the clamping piece.

11. A polishing device having in combination a long stick with an upper and lower flat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, said slot being parallel to the longitudinal axis of said stick and parallel to said lower flat side, means for pressing the bodies forming the sides of said slot together, a handle on the slotted end and on said upper flat side fitting in the palm of the human hand, a free part on the other end of said stick acting as a handle, a groove on said lower fiat side behind said free part and perpendicular to the longitudinal axis of said stick, containing a piece of resilient material on its bottom and being wider on its bottom, a clamping piece holding the free end of said strip into said groove, said clamping piece being U-shaped and its middle part being pressed into said groove by a cylindrical cam having a handle and being excentrically pivoted to the free sides of the clamping piece by a stud fitting loosely in an excentrical bore of said cam running parallel to the axis of said cam and tightly fitting in bores of said clamping piece and being held in its position by riveting the ends extending over the sides of said clamping piece, said handle being parallel to said axis of said stick and having its free end toward said slotted end of the stick if said clamping piece is in its tightening position.

12. A polishing device having in combination a long stick with an upper and lower flat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, said slot being parallel to the longitudinal axis of said stick and parallel to said lower flat side, means for pressing the bodies forming the sides of said slot together, a handle on the slotted end and on said upper flat side fitting in the palm of the human hand, a free part on the other end of said stick acting as a handle, a groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick, containing a piece of resilient material and being wider on its bottom, a clamping piece holding the free end of said strip into said groove, said clamping piece being U-shaped and its middle part being pressed into said groove by a cylindrical cam having a handle and being excentrically pivoted to the free sides of the clamping piece, and a cavity on said upper side for guiding and holding said cylindrical cam on said stick.

13. A polishing device having in combination a long stick with an upper and lower flat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, said slot beginning parallel to the longitudinal axis of said stick and parallel to said lower flat side, means for pressing the bodies forming the sides of said slot together consisting of a clamping bolt arranged in the middle and perpendicular to said slot, its head fastened and countersunk in said lower side and having on said upper side a cylindrical nut with a great ball like handle on its outer end fitting in the palm of the human hand, a free part on the other end of said stick acting as a handle, a groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick, containing a piece of resilient material and being wider on its bottom, a clamping piece holding the free end of said strip into said groove, said clamping piece being U-shaped and its middle part being pressed into said groove by a cylindrical cam having a handle and being excentrically pivoted to the free sides of the clamping piece by a stud fitting loosely in an excentrical bore of said cam running parallel to the axis of said cam and fitting tightly in bores in the sides of said clamping piece and being held in its position by riveting the ends of said stud extending over the sides of said clamping piece, said handle being parallel to the axis of said stick and having its free end toward said slotted end of the stick if said clamping piece is in its tightening position.

14. A polishing device having in combination a long stick with an upper and lower flat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, said slot being parallel to the longitudinal axis of said stick and parallel to said lower flat side, a clamping bolt arranged in the middle and perpendicular to said slot, its head fastened and countersunk in said lower side and having on said upper side a cylindrical nut with a great ball like handle on its outer end fitting in the palm of the human hand, a free part on the other end of said stick acting as a handle, a groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick, containing a piece of resilient material and being wider on its bottom, a

clamping piece holding the free end of said strip, said clamping piece being U-shaped and its middle part being pressed into said groove by a cylindrical cam having a handle and being excentrically pivoted to the free sides of said clamping piece, and a cavity on said upper side for guiding and holding said cylindrical cam on said stick.

15. A polishing device having in combination a long stick with an upper and lower flat side, a slot on one end of said stick being adapted to receive one or the other end of a strip of thin, flexible material, said slot being parallel to the longitudinal axis of said stick and parallel to said lower flat side, a clamping bolt arranged in the middle and perpendicular to said slot, its head being fastened and countersunk in said lower side and having on said upper side a cylindrical nut with a great ball like handle on its outer end fitting in the palm of the human hand, a free part on the other end of said stick acting as a handle, a groove on said lower flat side behind said free part and perpendicular to the longitudinal axis of said stick, containing a piece of resilient material and being wider on its bottom, a clamping piece holding the free end of said strip into said groove, said clamping piece being U-shaped and its middle part being pressed into said groove by a cylindrical cam having a handle and being excentrically pivoted to the free sides of said clamping piece by a stud fitting loosely in an excentrical bore of said cam running parallel to the axis or" said cam and tightly fitting in bores of said clamping piece and being held in its position by riveting the ends of it extending over the sides of said clamping piece, said handle being parallel to the axis of said stick and having its free end directed toward said slotted end of the stick if said clamping piece is in its tightening position, and a cavity on said upper side for guiding and holding said cylindrical cam on said stick.

References Cited in the file of this patent UNITED STATES PATENTS 59,933 Walker Nov. 20, 1866 428,585 Fanning May 20, 1890 842,579 Peters Jan. 29, 1907 881,557 Deming Mar. 10, 1908 2,492,602 Stenberg et al Dec. 27, 1949 2,569,253 Opland Sept. 25, 1951 FOREIGN PATENTS 201,977 Great Britain Aug. 13, 1923 514,898 Great Britain Nov. 21, 1939 

